But if they were dropped, even if by rare chance were the crumbs so large as to be nearly as large as half of a cake--why then, that crumb had to stay for those little birds. It was the law! The law that the little girls had made for themselves, and nobody but themselves knew about that law--for the good of the birds. But no little girl cared to disobey that law of their own that nobody but themselves knew about, for if one had--how dreadful it would have been.